VLAAMSE OVERHEID
DEPARTEMENT MOBILITEIT EN OPENBARE WERKEN
WATERBOUWKUNDIG LABORATORIUM
Langdurige metingen Deurganckdok 2: Opvolging en analyse
aanslibbing
Bestek 16EB/05/04
Deelrapport 1.20 : Sedimentbalans 01/04/2008 – 30/06/2008
Report 1.20 : Sediment balance 01/04/2008 – 30/06/2008
12 February 2009
I/RA/11283/08.076/MSA
i.s.m.
International Marine and Dredging Consultants (IMDC)
Coveliersstraat 15, 2600 Berchem, Antwerp, Belgium
tel: +32.3.270.92.95 - fax: +32.3.235.67.11
E-mail : info@imdc.be
IMDC NV i.s.m. WL|Delft Hydraulics
en Gems
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
Document Control Sheet
Document Identification
Title:
Report 1.20: Sediment balance 01/04/2008 – 30/06/2008
Project:
Langdurige metingen Deurganckdok 2: Opvolging en analyse aanslibbing
Client
Waterbouwkundig Laboratorium
File
I/RA/11283/08.076/MSA
reference:
File name K:\PROJECTS\11\11283
Opvolging
aanslibbing
dgd\10Rap\DGD3\1.20_RA08076_Apr_Jun08\RA08076_PeilingenApr_Jun2008_v20.doc
Revisions
Version Date
Author
Description
2.0
12/02/2009
BOB/JME
Final
1.0
30/09/2008
BOB/JME
Concept
Distribution List
Name
# ex.
Company/authorities
Joris Vanlede
7
Waterbouwkundig Laboratorium
Position
in
reference to the
project
Client
Frederik Roose
3
Afdeling Maritieme Toegang
Client
Approval
Version Date
2.0
12/02/2009
Author
BOB/JME
Project manager
MSA
Commissioner
MSA
1.0
BOB/JME
MSA
MSA
30/09/2008
I/RA/11283/08.076/MSA
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Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
TABLE OF CONTENTS
1. INTRODUCTION ............................................................................................................................................ 1 1.1. THE ASSIGNMENT ........................................................................................................................................... 1 1.2. PURPOSE OF THE STUDY ................................................................................................................................. 1 1.3. OVERVIEW OF THE REPORTS ........................................................................................................................... 2 1.3.1. Reports ............................................................................................................................. 2 1.3.2. Measurement actions ...................................................................................................... 5 1.4. STRUCTURE OF THE REPORT ........................................................................................................................... 6 2. 2.1. 2.2. 3. 3.1. 3.2. 3.3. 4. 4.1. 4.2. 4.3. 4.4. 4.5. 4.6. 4.7. 4.8. 5. 5.1. 5.2. 6. SEDIMENTATION IN DEURGANCKDOK ............................................................................................... 7 PROJECT AREA: DEURGANCKDOK ................................................................................................................. 7 OVERVIEW OF THE STUDIED PARAMETERS ..................................................................................................... 8 MEASUREMENTS........................................................................................................................................ 11 DEPTH SOUNDINGS ....................................................................................................................................... 11 DENSITY MEASUREMENTS ............................................................................................................................ 11 MAINTENANCE DREDGING DATA ................................................................................................................ 13 SEDIMENT BALANCE ANALYSES ......................................................................................................... 14 PROJECT AREA: (SUB)ZONES AND SECTIONS .............................................................................................. 14 DEPTH OF THE WATER-BED INTERFACE (210 KC) ........................................................................................ 16 EVOLUTION OF WATER-BED INTERFACE (210 KC) ....................................................................................... 17 VOLUMETRIC SILTATION RATES [CM/DAY] IN DIFFERENT ZONES AND SECTIONS ........................................ 19 DEPTH OF WATER-BED INTERFACE (1.03 KG/DM³) AND EQUAL DENSITY LAYERS ....................................... 19 EVOLUTION OF WATER-BED INTERFACE AND EQUAL DENSITY LAYERS ELEVATION.................................... 20 MEASURED MASS MAPS ................................................................................................................................ 21 AVERAGE NET MASS EVOLUTION ................................................................................................................. 22 PRELIMINARY ANALYSIS OF THE DATA .......................................................................................... 24 VOLUMETRIC ANALYSIS ............................................................................................................................... 24 DENSIMETRIC ANALYSIS .............................................................................................................................. 24 REFERENCES ............................................................................................................................................... 27 APPENDICES
APPENDIX A. APPENDIX B. APPENDIX C. APPENDIX D. APPENDIX E. APPENDIX F. APPENDIX G. APPENDIX H. APPENDIX I. APPENDIX J. DEPTH OF THE WATER-BED INTERFACE (210 KC) ................................................................... 29 EVOLUTION OF DEPTH OF WATER-BED INTERFACE (210 KC) ................................................. 32 VOLUMETRIC SILTATION RATES IN DIFFERENT ZONES AND SECTIONS .................................... 55 DEPTH OF WATER-BED INTERFACE AND EQUAL DENSITY LAYERS .......................................... 86 DEPTH OF PLANES OF CONSTANT DENSITY .............................................................................. 93 DEPTH EVOLUTION OF PLANES OF CONSTANT DENSITY........................................................ 108 SEDIMENT MASS DISTRIBUTION IN DEURGANCKDOK ........................................................... 126 AVERAGE MASS GROWTH AND GROWTH RATE...................................................................... 129 DREDGING DATA ................................................................................................................... 153 SWEEP BEAM DREDGING DATA .............................................................................................. 155 I/RA/11283/08.076/MSA
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Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
LIST OF TABLES
TABLE 1-1: OVERVIEW OF DEURGANCKDOK REPORTS ............................................................................................... 2 TABLE 3-1: OVERVIEW OF THE AVAILABLE DEPTH SOUNDINGS SUITABLE FOR ANALYSIS 01/04/2008 – 30/06/200811 TABLE 3-2: REFERENCE SITUATION DENSITY MEASUREMENTS (T0D)....................................................................... 12 TABLE 3-3: SWEEP BEAM MAINTENANCE DREDGING ACTIVITIES IN DEURGANCKDOK AND ON THE SILL OF
DEURGANCKDOK BETWEEN APRIL AND JUNE 2008 (SOURCE: AFDELING MARITIEME TOEGANG) ................. 13 TABLE 4-1: COORDINATES OF SECTIONS [UTM ED50] ............................................................................................ 16 TABLE 5-1: DREDGED SEDIMENT MASS (TDS) .......................................................................................................... 25 TABLE 5-2: TOTAL SEDIMENT MASS (MEASURED + DREDGED, IN 10³ TDS) IN SOME ZONES .................................... 26 TABLE 5-3: MASS SETTLED PER SUBZONE IN ZONES 3 AND 4 (MEASURED + DREDGED, IN 10³ TDS) ....................... 26 LIST OF FIGURES
FIGURE 2-1: OVERVIEW OF DEURGANCKDOK ............................................................................................................. 7 FIGURE 2-2: ELEMENTS OF THE SEDIMENT BALANCE .................................................................................................. 8 FIGURE 2-3: DETERMINING A SEDIMENT BALANCE ..................................................................................................... 9 FIGURE 2-4: TRANSPORT MECHANISMS ..................................................................................................................... 10 FIGURE 3-1: NAVITRACKER ....................................................................................................................................... 12 FIGURE 4-1: DEURGANCKDOK: ZONES AND SUBZONES ............................................................................................ 14 FIGURE 4-2: DEURGANCKDOK: D AND L SECTIONS .................................................................................................. 15 FIGURE 4-3: EXAMPLE OF A MAP SHOWING DEPTH OF WATER-BED INTERFACE (210 KC) FOR 13/03/08 AND 11/04/08
17 FIGURE 4-4: DIFFERENCE CHARTS OF THE DEPTH SOUNDING ON 9/05/08: IN REFERENCE TO T0E (LEFT), AND TO THE
PREVIOUS MEASUREMENT (RIGHT) ON 11/04/08............................................................................................... 18 FIGURE 4-5: GRAPH OF EVOLUTION OF THE WATER-BED INTERFACE (210 KC) FOR SECTION D5 ............................ 18 FIGURE 4-6: VOLUMETRIC SILTATION RATE FOR ZONE 3A ........................................................................................ 19 FIGURE 4-7: DEPTH OF WATER-BED INTERFACE AND EQUAL DENSITY LAYERS IN SECTION D4 ON 28 APRIL 2008 . 20 FIGURE 4-8: MAP OF THE DEPTH OF THE WATER-BED INTERFACE AND EQUAL DENSITY LAYERS FOR 28/04/08 ...... 20 FIGURE 4-9: GRAPH OF THE EVOLUTION OF 1.1 KG/DM³ PLANE IN SECTION D3 ........................................................ 21 FIGURE 4-10: MAP SHOWING THE LOCATION OF THE DENSITY PROFILES (LEFT) AND THE CALCULATION OF TDS
(RIGHT) ON 28/04/08 ......................................................................................................................................... 21 FIGURE 4-11: FLOW CHART WITH DIFFERENT ELEMENTS CONTRIBUTING TO TOTAL SEDIMENT MASS FOR (SUB)ZONES
AND TOTAL AREA .............................................................................................................................................. 22 FIGURE 4-12: EXAMPLE OF AVERAGED MASS GROWTH AND MASS EVOLUTION FOR SUBZONE 3B ........................... 23 I/RA/11283/08.076/MSA
III
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Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
GLOSSARY
BIS
Dredging Information System used in the Lower Sea Scheldt
d
Density of dredged sediment [kg/dm³]
DGD
Deurganckdok
HCBS
High Concentration Benthic Suspensions
M
mass of dry solids [ton]
ρs
density of the solid minerals [kg/dm³]
ρw
density of clear water [kg/dm³]
t0d
Reference situation for densimetric analysis (empty dock)
t0e
Reference situation for volumetric analysis (24 March 2006)
TDS
Ton of dry solids [ton]
V
volume of dredged sediment [m³]
I/RA/11283/08.076/MSA
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Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
1. INTRODUCTION
1.1. The assignment
This report is part of the set of reports describing the results of the long-term measurements
conducted in Deurganckdok aiming at the monitoring and analysis of silt accretion. This
measurement campaign is an extension of the study “Extension of the study about density currents
in the Beneden Zeeschelde” as part of the Long Term Vision for the Scheldt estuary. It is
complementary to the study ‘Field measurements high-concentration benthic suspensions (HCBS
2)’.
The terms of reference for this study were prepared by the ‘Departement Mobiliteit en Openbare
Werken van de Vlaamse Overheid, Afdeling Waterbouwkundig Laboratorium’ (16EB/05/04). The
repetition of this study was awarded to International Marine and Dredging Consultants NV in
association with WL|Delft Hydraulics and Gems International on 10/01/2006. The project term was
repeated twice with an extra year from April 2007 till March 2008, and April 2008 till March 2009.
Waterbouwkundig Laboratorium– Cel Hydrometrie Schelde provided data on discharge, tide,
salinity and turbidity along the river Scheldt and provided survey vessels for the long term and
through tide measurements. Afdeling Maritieme Toegang provided maintenance dredging data.
Agentschap voor Maritieme Dienstverlening en Kust – Afdeling Kust and Port of Antwerp provided
depth sounding measurements.
The execution of the study involves a twofold assignment:
•
•
Part 1: Setting up a sediment balance of Deurganckdok covering a period of one year, i.e.
04/2008 – 03/2009
Part 2: An analysis of the parameters contributing to siltation in Deurganckdok
1.2. Purpose of the study
The Lower Sea Scheldt (Beneden Zeeschelde) is the stretch of the Scheldt estuary between the
Belgium-Dutch border and Rupelmonde, where the entrance channels to the Antwerp sea locks
are located. The navigation channel has a sandy bed, whereas the shallower areas (intertidal
areas, mud flats, salt marshes) consist of sandy clay or even pure mud sometimes. This part of the
Scheldt is characterized by large horizontal salinity gradients and the presence of a turbidity
maximum with depth-averaged concentrations ranging from 50 to 500 mg/l at grain sizes of 60 100 μm. The salinity gradients generate significant density currents between the river and the
entrance channels to the locks, causing large siltation rates. It is to be expected that in the near
future also the Deurganckdok will suffer from such large siltation rates, which may double the
amount of dredging material to be dumped in the Lower Sea Scheldt.
Results from the study may be interpreted by comparison with results from the HCBS and HCBS2
studies covering the whole Lower Sea Scheldt. These studies included through-tide measurement
campaigns in the vicinity of Deurganckdok and long term measurements of turbidity and salinity in
and near Deurganckdok.
The first part of the study focuses on obtaining a sediment balance of Deurganckdok. Aside from
natural sedimentation, the sediment balance is influenced by the maintenance and capital dredging
works. This involves sediment influx from capital dredging works in the Deurganckdok, and internal
relocation and removal of sediment by maintenance dredging works. To compute a sediment
balance an inventory of bathymetric data (depth soundings), density measurements of the
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Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
deposited material and detailed information of capital and maintenance dredging works will be
made up.
The second part of the study is to gain insight in the mechanisms causing siltation in
Deurganckdok, it is important to follow the evolution of the parameters involved, and this on a long
and short term basis (long term & through-tide measurements). Previous research has shown the
importance of water exchange at the entrance of Deurganckdok is essential for understanding
sediment transport between the dock and the Scheldt river.
1.3. Overview of the reports
1.3.1. Reports
Reports of the project ‘Opvolging aanslibbing Deurganckdok’ and ‘Opvolging aanslibbing
Deurganckdok 2’ for the period April 2006 – March 2008 are summarized in Table 1-1.
Table 1-1: Overview of Deurganckdok Reports
Report
Description
Sediment Balance: Bathymetry surveys, Density measurements, Maintenance and
construction dredging activities
Sediment Balance: Three monthly report 1/4/2006 – 30/06/2006
1.1
(I/RA/11283/06.113/MSA)
1.2
Sediment Balance: Three monthly report 1/7/2006 – 30/09/2006
(I/RA/11283/06.114/MSA)
1.3
Sediment Balance: Three monthly report 1/10/2006 – 31/12/2006
(I/RA/11283/06.115/MSA)
1.4
Sediment Balance: Three monthly report 1/1/2007 – 31/03/2007
(I/RA/11283/06.116/MSA)
1.5
Annual Sediment Balance (I/RA/11283/06.117/MSA)
1.6
Sediment balance Bathymetry: 2005 – 3/2006 (I/RA/11283/06.118/MSA)
1.10
Sediment Balance: Three monthly report 1/4/2007 30/06/2007(I/RA/11283/07.081/MSA)
1.11
Sediment Balance: Two monthly report 1/7/2007 – 31/08/2007
(I/RA/11283/07.082/MSA)
1.12
Sediment Balance: Four monthly report 1/09/2007 – 31/12/2007
(I/RA/11283/07.083/MSA)
1.13
Sediment Balance: Three monthly report 1/1/2008 – 31/03/2008
(I/RA/11283/07.084/MSA)
1.14
Annual Sediment Balance (I/RA/11283/07.085/MSA)
1.20
Sediment Balance: Three monthly report 1/4/2008 - 30/6/2008
(I/RA/11283/08.076/MSA)
1.21
Sediment Balance: Three monthly report 1/7/2008 – 30/9/2008
I/RA/11283/08.076/MSA
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Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
Description
(I/RA/11283/08.077/MSA)
1.22
Sediment Balance: Three monthly report 1/10/2008 – 31/12/2008
(I/RA/11283/08.078/MSA)
1.23
Sediment Balance: Three monthly report 1/1/2009 – 31/03/2009
(I/RA/11283/08.079/MSA)
1.24
Annual Sediment Balance (I/RA/11283/08,080/MSA)
Factors contributing to salt and sediment distribution in Deurganckdok: Salt-Silt (OBS3A)
& Frame measurements, Through tide measurements (SiltProfiling & ADCP) &
Calibrations
2.1
Through tide measurement Siltprofiler 21/03/2006 Laure Marie
(I/RA/11283/06.087/WGO)
2.2
Through tide measurement Siltprofiler 26/09/2006 Stream (I/RA/11283/06.068/MSA)
2.3
Through tide measurement Sediview spring tide 22/03/2006 Veremans
(I/RA/11283/06.110/BDC)
2.4
Through tide measurement Sediview spring tide 27/09/2006 Parel 2
(I/RA/11283/06.119/MSA)
2.5
Through tide measurement Sediview neap tide (to be scheduled)
(I/RA/11283/06.120/MSA)
2.6
Salinity-Silt distribution & Frame Measurements Deurganckdok 13/3/2006 –
31/05/2006 (I/RA/11283/06.121/MSA)
2.7
Salinity-Silt distribution & Frame Measurements Deurganckdok 15/07/2006 –
31/10/2006 (I/RA/11283/06.122/MSA)
2.8
Salinity-Silt distribution & Frame Measurements Deurganckdok 15/01/2007 –
15/03/2007 (I/RA/11283/06.123/MSA)
2.9
Calibration stationary equipment autumn (I/RA/11283/07.095/MSA)
2.10
Through tide measurement Siltprofiler winter (I/RA/11283/07.086/MSA)
2.11
Through tide measurement Salinity Profiling winter (I/RA/11283/07.087/MSA)
2.12
Through tide measurement Sediview winter (I/RA/11283/07.088/MSA)
2.13
Through tide measurement Sediview winter (I/RA/11283/07.089/MSA)
2.14
Through tide measurement Sediview winter (I/RA/11283/07.090/MSA)
2.15
Through tide measurement Siltprofiler (to be scheduled) (I/RA/11283/07.091/MSA)
2.16
Salt-Silt distribution Deurganckdok summer (21/6/2007 – 30/07/2007)
(I/RA/11283/07.092/MSA)
2.17
Salt-Silt distribution & Frame Measurements Deurganckdok autumn (17/09/2007 10/12/2007) (I/RA/11283/07.093/MSA)
2.18
Salt-Silt distribution & Frame Measurements Deurganckdok winter (18/02/2008 31/3/2008) (I/RA/11283/07.094/MSA)
I/RA/11283/08.076/MSA
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Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
Report
2.19
Description
Calibration stationary & mobile equipment winter (I/RA/11283/07.096/MSA)
2.20
Through tide measurement Sediview DGD during neap tide Spring 2008
(I/RA/11283/08.081/MSA)
2.21
Through tide measurement Sediview DGD during spring tide Spring 2008
(I/RA/11283/08.082/MSA)
2.22
Through tide measurement Sediview DGD during neap tide Summer 2008
(I/RA/11283/08.083/MSA)
2.23
Through tide measurement Sediview DGD during spring tide Summer 2008
(I/RA/11283/08.084/MSA)
2.24
Through tide measurement Sediview DGD during neap tide Autumn 2008
(I/RA/11283/08.085/MSA)
2.25
Through tide measurement Sediview DGD during spring tide Autumn 2008
(I/RA/11283/08.086/MSA)
2.26
Through tide measurement Sediview DGD during neap tide Winter 2009
(I/RA/11283/08.087/MSA)
2.27
Through tide measurement Sediview DGD during spring tide Winter 2009
(I/RA/11283/08.088/MSA)
2.28
Through tide measurement ADCP eddy DGD Summer 2008
(I/RA/11283/08.089/MSA)
2.29
Through tide measurement Siltprofiler DGD Summer 2008 (I/RA/11283/08.090/MSA)
2.30
Through tide measurement Siltprofiler DGD Winter 2009 (I/RA/11283/08.091/MSA)
2.31
Through tide measurement Salinity Profiling DGD Winter 2009
(I/RA/11283/08.092/MSA)
2.32
Salt-Silt distribution Deurganckdok: Six monthly report 1/4/2008 - 30/9/2008
(I/RA/11283/08.093/MSA)
2.33
Salt-Silt distribution Deurganckdok: Six monthly report 1/10/2008 – 31/3/2009
(I/RA/11283/08.094/MSA)
2.34
Calibration stationary & mobile equipment Autumn 2008 (I/RA/11283/08.095/MSA)
Boundary Conditions: Upriver Discharge, Salt concentration Scheldt, Bathymetric
evolution in access channels, dredging activities in Lower Sea Scheldt and access
channels
Boundary
conditions:
Three
monthly
report
1/1/2007
–
31/03/2007
3.1
(I/RA/11283/06.127/MSA)
Boundary conditions: Three monthly report 1/4/2007 – 30/06/2007
3.10
(I/RA/11283/07.097/MSA)
3.11
Boundary conditions: Three monthly report 1/7/2007 – 30/09/2007
(I/RA/11283/07.098/MSA)
3.12
Boundary conditions: Three monthly report 1/10/2007 – 31/12/2007
(I/RA/11283/07.099/MSA)
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3.13
Description
Boundary conditions: Three monthly report 1/1/2008 – 31/03/2008
(I/RA/11283/07.100/MSA)
3.14
Boundary conditions: Annual report (I/RA/11283/07.101/MSA)
3.20
Boundary conditions: Six monthly report 1/4/2008 – 30/09/2008
(I/RA/11283/08.096/MSA)
3.21
Boundary conditions: Six monthly report 1/10/2008 – 31/03/2009
(I/RA/11283/08.097/MSA)
Analysis
4.1
Analysis of Siltation Processes and Factors (I/RA/11283/06.129/MSA)
4.10
Analysis of Siltation Processes and Factors (I/RA/11283/07.102/MSA)
4.20
Analysis of Siltation Processes and Factors (I/RA/11283/08.098/MSA)
1.3.2. Measurement actions
Following measurements have been carried out during the course of this project:
1. Monitoring upstream discharge in the Scheldt river
2. Monitoring Salt and sediment concentration in the Lower Sea Scheldt taken from on
permanent data acquisition sites at Lillo, Oosterweel and up- and downstream of the
Deurganckdok.
3. Long term measurement of salt distribution in Deurganckdok.
4. Long term measurement of sediment concentration in Deurganckdok
5. Monitoring near-bed processes in the central trench in the dock, near the entrance as well
as near the landward end: near-bed turbidity, near-bed current velocity and bed elevation
variations are measured from a fixed frame placed on the dock’s bed.
6. Measurement of current, salt and sediment transport at the entrance of Deurganckdok for
which ADCP backscatter intensity over a full cross section are calibrated with the Sediview
procedure and vertical sediment and salt profiles are recorded with the SiltProfiler
equipment
7. Through tide measurements of vertical sediment concentration profiles -including near bed
highly concentrated suspensions- with the SiltProfiler equipment. Executed over a grid of
points near the entrance of Deurganckdok.
8. Monitoring dredging activities at entrance channels towards the Kallo, Zandvliet and
Berendrecht locks
9. Monitoring dredging and dumping activities in the Lower Sea Scheldt
In situ calibrations were conducted to calibrate all turbidity and conductivity sensors (IMDC, 2006f
& IMDC, 2007l).
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Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
1.4. Structure of the report
This report is the sediment balance of the Deurganckdok for the period of 01/04/2008 to
30/06/2008. The first chapter comprises an introduction. The second chapter describes the project.
Chapter 3 describes the methodology. The measurement results and processed data are
presented in Chapter 4, whereas chapter 5 gives a preliminary analysis of the data.
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Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
2. SEDIMENTATION IN DEURGANCKDOK
2.1. Project Area: Deurganckdok
Deurganckdok is a tidal dock situated at the left bank in the Lower Sea Scheldt, between
Liefkenshoek and Doel. Deurganckdok has the following characteristics:
1.
2.
3.
The dock has a total length of 2750 m and is 450 m wide at the Scheldt end and 400 m wide
at the inward end of the dock
The bottom of Deurganckdok is provided at a depth of –17m TAW in the transition zones
between the quay walls and the central trench. The bottom in the central trench is designed
at –19 m TAW.
The quay walls reach up to +9m TAW
Figure 2-1: Overview of Deurganckdok
The dredging of the dock is performed in 3 phases. On 18 February 2005 the dike between the
Scheldt and the Deurganckdok was breached. On 6 July 2005 Deurganckdok was officially
opened. The second dredging phase was finalized a few weeks later. The first terminal operations
have started since. In February 2007, the third dredging phase started and is finalised by February
2008.
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Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
2.2. Overview of the studied parameters
The first part of the study aims at determining a sediment balance of Deurganckdok and the net
influx of sediment. The sediment balance comprises a number of sediment transport modes:
deposition, influx from capital dredging works, internal replacement and removal of sediments due
to maintenance dredging (Figure 2-2).
Figure 2-2: Elements of the sediment balance
A net deposition can be calculated from a comparison with a chosen initial condition t0 (Figure 2-3).
The mass of deposited sediment is determined from the integration of bed density profiles
recorded at grid points covering the dock. Subtracting bed sediment mass at t0 leads to the change
in mass of sediments present in the dock (mass growth). Adding cumulated dry matter mass of
dredged material removed since t0 and subtracting any sediment influx due to capital dredging
works leads to the total cumulated mass entered from the Scheldt river since t0.
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Figure 2-3: Determining a sediment balance
The main purpose of the second part of the study is to gain insight in the mechanisms causing
siltation in Deurganckdok. The following mechanisms will be aimed at in this part of the study:
•
•
•
•
Tidal prism, i.e. the extra volume in a water body due to high tide
Vortex patterns due to passing tidal current
Density currents due to salt gradient between the Scheldt river and the dock
Density currents due to highly concentrated benthic suspensions
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Figure 2-4: Transport mechanisms
These aspects of hydrodynamics and sediment transport have been landmark in determining the
parameters to be measured during the project. Measurements will be focused on three types of
timescales: one tidal cycle, one neap-spring cycle and seasonal variation within one year.
Following data are being collected to understand these mechanisms:
•
•
•
•
•
•
•
•
Monitoring upstream discharge in the Scheldt river.
Monitoring Salt and sediment concentration in the Lower Sea Scheldt at permanent
measurement locations at Oosterweel, up- and downstream of the Deurganckdok.
Long term measurement of salt and suspended sediment distribution in Deurganckdok.
Monitoring near-bed processes (current velocity, turbidity, and bed elevation variations) in the
central trench in the dock, near the entrance as well as near the current deflecting wall location.
Dynamic measurements of current, salt and sediment transport at the entrance of
Deurganckdok.
Through tide measurements of vertical sediment concentration profiles -including near bed
high concentrated benthic suspensions.
Monitoring dredging activities at entrance channels towards the Kallo, Zandvliet and
Berendrecht locks as well as dredging and dumping activities in the Lower Sea Scheldt.
In situ calibrations were conducted on several dates to calibrate all turbidity and conductivity
sensors.
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3. MEASUREMENTS
3.1. Depth soundings
The client executes dual-frequency echo-sounder measurements every week to every three
weeks. F. De Cock (Agentschap voor Maritieme Dienstverlening en Kust – Afdeling Kust)
communicated that these measurements are carried out with a 210-33 kC Echo sounder using
Qinsy software. The depth sounding measurements are executed in a grid configuration,
consisting of sections perpendicular and parallel to the quay wall.
Table 3-1: Overview of the available depth soundings suitable for analysis 01/04/2008 – 30/06/2008
date
13/03/2008*
11/04/2008
9/05/2008
4/06/2008
type of measurement
dual frequency 210-33 kHz
dual frequency 210-33 kHz
dual frequency 210-33 kHz
dual frequency 210-33 kHz
signal
210
210
210
210
Source
Afdeling Kust
Afdeling Kust
Afdeling Kust
Afdeling Kust
*= reference situation depth soundings: t0e
To calculate a sediment balance it is necessary to analyse the measurements in stationary
situation, with no alteration in boundary conditions being dredging operations. Every period is
characterized by a depth sounding measurement before (‘inpeiling’) and one after (‘uitpeiling’).
A number of analyses were done using the depth soundings in Table 3-1. The raw depth sounding
data was processed in ESRI ArcGIS. The 210 kC signal is used in the following analyses as it
gives an indication of the water-bed interface.
A reference level was chosen from all depth sounding measurements. Previous reports used the
earliest measurement as reference level, i.e. 24 March 2006. In February 2008, the capital
dredging of the dock was finalized such that a significant larger measurement area became
applicable. A new reference situation, initial condition t0e, therefore seemed plausible for which the
depth sounding of 13 March 2008 was selected.
A number of analyses were performed in ArcGIS 9 and a Matlab environment to produce maps,
figures and tables with relevant information concerning elevation, elevation changes and
volumetric growth (§4.2 to §4.4).
3.2. Density measurements
Navitracker was used to perform density measurements. Density measurements are necessary to
calculate a sediment balance of dry weight of sediment per surface unit.
The Navitracker is a patented system to measure the density of fluid mud suspensions, by means
of a gamma-density meter. It has been used by the Flemish authorities over 20 years to determine
the nautical bed for the port of Zeebrugge.
The Navitracker system can be operated by a computer controlled winch to tow it through the mud
(horizontal mode). The Navitracker is equipped with the following sensors:
•
•
•
The Gamma ray density sensor, mounted on a fork-like tow fish, gives density information.
The depth sensor gives information of the depth of the sensor.
The position of the fish is calculated out of the length of the winch cable. Together with the
position of the tow fish, following the density level, a dual frequency echo sounder is used to
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map the hard bottom and the top of the mud. With a speed of 2 to 3 knots, large areas can be
covered.
For these measurements the Navitracker was used in a vertical profiling mode, with the probe in
vertical position in order to penetrate the soft bottom. The vertical density profiler is used to
measure density in thick mud layers with high densities.
Figure 3-1: Navitracker
The Navitracker was calibrated in the laboratory for measuring high densities, formed by very
dense water-mud mixtures. For this reason the Navitracker did not detect subtle variations in
density caused by changes in salinity. The density deviated from 1.000 ton/m³ only in the presence
of a high concentration of sediments.
The Navitracker has a sampling frequency of 10 measurements per second.
As a reference situation the empty dock will be used at the design depth. The design depths for the
different zones are shown in Table 3-2. The different zones are described in §4.1.
Table 3-2: Reference Situation Density Measurements (t0d)
Zone
Design Depth (mTAW)
Central trench
-19
Berthing zones and transition zones to central trench
-17
Sill
-13.5
Transition sill to navigation channel
Not applicable
The resulting profiles were processed in a Matlab environment and visualized in Matlab and ESRI
ArcGIS. Equal density layers were computed. Volume and density information was used to
calculate masses of silt. All masses are given in ton of dry solids (TDS) characterized by a density
of 2.65 kg/dm³. The water-bed interface is defined as the layer with a density of 1.03 kg/dm³.
In this measurement campaign, Navitracker density measurements have been performed on 28
April and 5 June 2008.
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3.3. Maintenance Dredging Data
All maintenance dredging (except sweep beam) activities in Deurganckdok were collected in the
BIS-system. This system gives a standardised output per week, that states the weight, volume and
V’1 removed/dumped in every 5*5m grid cell in the area. In case the density of the dredged
sediment in the hopper bin is larger or equal to 1.6 kg/dm³, V’ is equal to the volume in the bin. In
case the density is smaller than 1.6 kg/dm³, V’ is equal to the reduced volume which is defined as
the volume the dredged sediment would have in case the density would be equal to 2 kg/dm³
(AWZ 2000). These dredged volumes are important to have an overall view on the sediment
balance. Maintenance dredging occurred in the second half of May.
The available data on sweep beam activity is not collected in the BIS-system. However, the mode
of operation of the sweep beam is explained:
•
•
On the sill (zone 1 & 2): the sediment is swept into the Lower Sea Scheldt
Inside the dock: the sweep beam sweeps the berthing zones next to the quay walls and moves
sediment into the central trench
Therefore an overview is given of where and when a sweep beam dredger was working in
Deurganckdok (DGD) or on the sill of Deurganckdok (sill DGD).
Table 3-3: Sweep beam maintenance dredging activities in Deurganckdok and on the sill of Deurganckdok
between April and June 2008 (source: Afdeling Maritieme Toegang)
From
Till
Duration (days)
Location
1/04/2008
7/04/2008
14/04/2008
5/04/2008
9/04/2008
16/04/2008
5
3
3
21/04/2008
28/04/2008
5/05/2008
19/05/2008
26/05/2008
2/06/2008
23/6/2008
30/6/2008
21/04/2008
28/04/2008
5/05/2008
20/05/2008
27/05/2008
2/06/2008
23/6/2008
30/6/2008
1
1
1
2
2
1
1
1
Commercial quays
Sill DGD + commercial quays
Sill DGD + sediment bump at 2/3’rd of
the dock
Sill DGD + DGD
Sill DGD
Sill DGD
Sill DGD
Sill DGD
Sill DGD
Sill DGD
Sill DGD
An overview of the total dredged mass in all zones (BIS data) is provided in APPENDIX I. The
sweep beam tracks are shown in APPENDIX J. The loggings of the sweep beam tracks show the
position and depth of the rake. From the up-down position of the rake and the ship’s direction, it is
possible to identify whether the ship is sweeping sediment into the Scheldt or not.
1
V’ = Reduced Volume
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4. SEDIMENT BALANCE ANALYSES
4.1. Project Area: (Sub)Zones and Sections
To calculate volumes and masses for the sediment balance of Deurganckdok it is necessary to
subdivide it into 5 zones:
•
•
•
•
•
Zone 1: Between the sill and the navigation channel in the Lower Sea Scheldt.
Zone 2: Sill at entrance DGD designed at –13.5 m TAW.
Zone 3: Central trench in DGD with a design depth at –19 m TAW (including slope to –17 m
TAW)
Zone 4: Transition between central trench and berthing zones with a design depth at –17.00 m
TAW: on both (North (N) and South (Z)) sides of DGD (55 m wide).
Zone 5: Berthing zones next to quay walls on both (North (N) and South (Z)) sides of DGD (40
m wide)
Zones 3, 4 and 5 are subdivided into subzones A, B, C, D and E. This is shown in Figure 4-1.
Figure 4-1: Deurganckdok: Zones and Subzones
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Sections are defined for this whole area (Figure 4-2):
•
•
D sections are oriented perpendicular to the quay walls inside the dock and parallel to the
navigation channel outside the dock (sill and Scheldt). The origin of the sections is taken on the
quay wall at the left bank (West side) looking outwards.
L Sections are oriented along the centerline of the dock and run from the navigation channel
towards the inland end of the dock, in anticipation of the realisation of the third phase of
Deurganckdok. The origin is situated on the intersection between each L section and section
D10.
Figure 4-2: Deurganckdok: D and L Sections
The coordinates of these sections are given in Table 4-1.
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Table 4-1: Coordinates of Sections [UTM ED50]
Name
D Sections
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
L Sections
L1
L2
L3
Origin
Easting
Northing
End
Easting
Northing
587773
587929
588084
588239
588394
588542
588521
588552
588585
588617
587615
587459
587300
587143
5683253
5683510
5683767
5684023
5684280
5684526
5684761
5684875
5684930
5684984
5682997
5682742
5682487
5682232
588123
588283
588444
588604
588765
588772
588864
588972
589047
589081
587962
587802
587642
587482
5683037
5683290
5683544
5683797
5684051
5684062
5684068
5684027
5683994
5684047
5682783
5682529
5682276
5682023
588748
588825
588901
5684720
5684565
5684410
587180
587290
587409
5682151
5682082
5682007
4.2. Depth of the water-bed interface (210 kC)
This is shown as a GIS grid map generated directly from the depth sounding data and is shown in
APPENDIX A. An example is shown in Figure 4-3.
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Figure 4-3: Example of a map showing depth of water-bed interface (210 kC) for 13/03/08 and 11/04/08
4.3. Evolution of water-bed interface (210 kC)
GIS grid maps show the difference charts for every depth sounding in relation to the reference
situation (t0e) and to the previous depth sounding (right). An example is shown in Figure 4-4.
The difference in depth between subsequent depth soundings for 210 kC measurements is also
shown for all predefined sections. Graphs show a colour plot with Time in the X-axis, Distance to
origin of section in the Y-axis and the depth of the top layer [m TAW] as a colour plot.
The origin for de the D sections is the northern quay wall. The origin of the L sections is the
intersection between the L section with the Scheldt edge of zone 1. An example for sections is
shown in Figure 4-5. The description of the sections is given in § 4.1.
Maps and graphs are shown in APPENDIX B.
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Figure 4-4: Difference charts of the depth sounding on 9/05/08: in reference to t0e (left), and to the previous
measurement (right) on 11/04/08
Figure 4-5: Graph of Evolution of the water-bed interface (210 kC) for section D5
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4.4. Volumetric siltation rates [cm/day] in different zones and sections
A table with monthly average siltation rates for all (sub)zones is also given in APPENDIX C.
Graphs in APPENDIX C show two parameters:
•
•
Average siltation rates [cm/day]: The average siltation rate is the difference in the depth of the
water-bed interface and is calculated only for those zones and subzones that have at least a
50% surface area overlap between two subsequent depth soundings. This is done for all
successive depth soundings. It is shown in the plots as a bar and is positive for sedimentation
and negative for erosion or removal.
Cumulative bed level change [m]: an initial situation (t0) is used as baseline. Starting from this
reference level the evolution of the average bed level elevation is shown for the particular
(sub)zone.
Dredging events from the BIS system are marked on each of these graphs. This is computed for all
zones, subzones, sections and Deurganckdok as a whole. As an example we show siltation rate
and cumulative bed level change for zone 3a in Figure 4-6.
Figure 4-6: Volumetric siltation rate for zone 3a
4.5. Depth of water-bed interface (1.03 kg/dm³) and equal density
layers
This analysis is based on density profile measurements from the Navitracker. Maps show the
depth of water-bed interface and equal density layers (1.1, 1.2, 1.3 kg/dm³). The elevation of the
water-bed interface is here defined as the depth at which the equipment encounters a density of
1.03 kg/dm³. This threshold is chosen since the maximum weight of salt and suspended sediment
in the water column is estimated at 30 g/l, corresponding with a bulk density of about 1.03 kg/dm³.
When the density passes this value, the equipment is assumed to reach the water-bed interface.
The depth of the layers of constant density can be found in APPENDIX D, whereas APPENDIX E
gives the density profiles for the different sections in Deurganckdok. An example for equal density
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layers in section D4 is given in Figure 4-7. An example of a map is given in Figure 4-8. The
description of the sections is given in § 4.1.
Figure 4-7: Depth of water-bed interface and equal density layers in section D4 on 28 April 2008
Figure 4-8: Map of the depth of the water-bed interface and equal density layers for 28/04/08
4.6. Evolution of water-bed interface and equal density layers
elevation
The evolution of water-bed interface and equal density layers (1.1, 1.2 en 1.3 kg/dm³) are shown
for all sections in APPENDIX F. The description of the sections is given in § 4.1. Note that the last
measurement of the previous measurement campaign, i.e. 4 December 2007, is added to the
present data series in order to have a good view on the density evolution. This makes 3 density
measurements in total being used for this comparison. Sections of four different planes of constant
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density are determined. These planes are determined by mapping the depths at which the
specified densities have been encountered. For every measurement campaign the elevation of
these planes across the sections has been plotted. An example is shown in Figure 4-9
Figure 4-9: Graph of the evolution of 1.1 kg/dm³ plane in section D3
4.7. Measured mass maps
The measured mass in [TDS/m²] is calculated and visualized in maps for every measurement in
reference to the empty dock at design depth (reference situation t0d) (see §3.2). Every map is
based on a density measurement.
These maps are shown in APPENDIX G.
Figure 4-10: Map showing the location of the density profiles (left) and the calculation of TDS (right) on
28/04/08
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4.8. Average net mass evolution
The average net mass growth [TDS/m²] in all zones and subzones is based on density profile
measurements (measured sediment mass). The actual sediment mass present in the dock and
measured by density profiling does not take the removed dredged material into account. The mass
removed by dredging can be computed from BIS data (dredged material mass). Only zones
spatially covered for 50% or more by density measurements are considered for sediment mass
calculations. Unmeasured parts of these zones retrieve a value for the calculations (in order to
close the mass balance of the zone), being the average mass per square meter based on the
actual density measurements of the considered zone.
By adding measured mass to dredged material mass, the total accumulated mass and hence the
growth can be shown (see Figure 4-11). In case this total mass can be computed for the complete
dock (or a zone) for two subsequent measurements, an estimation of the net sediment flux into the
dock (or zone) during the intermediate period is given by the difference of both total mass values.
The net sediment flux into an area can also be defined as the net mass growth (kg/m² or Ton Dry
Solids/m²). Division of the net mass growth of a zone by the number of days in between
measurements leads to the averaged net mass growth rate. Note that the last measurement of the
previous measurement campaign, i.e. 22 February 2008, is added to the present data series in
order to have a good view on the net mass evolution.
Averaged net mass growth rate [kg/m²/day] is computed for each zone and subzone and is shown
in APPENDIX H. An example is shown for zone 3B in Figure 4-12.
Figure 4-11: Flow chart with different elements contributing to total sediment mass for (sub)zones and total
area
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Figure 4-12: Example of averaged mass growth and mass evolution for subzone 3B
Clearly, the sediment mass balance is incomplete because sediment fluxes cannot be derived from
the sweep beam data (of which no mass or volume information is available). Internal movements
of sediment by the sweep beam (berthing zones to central trench) and removal of sediments from
the sill into the Lower Sea Scheldt definitely influence the mass balance for (sub)zones and the
total dock.
A table in APPENDIX H gives an overview for all zones and subzones for the following
parameters, and this only if data is available for at least 50 % of this (sub)zone:
•
•
•
•
•
•
•
Measured Sediment mass [TDS/m²]
Dredged Material mass (absolute) [TDS]
Total Sediment mass [TDS/m²]
Growth rate [kg/m²/day]]
Total area [ha]
Covered area [ha]: area covered by density profiles
Percent of zone covered [%]
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5. PRELIMINARY ANALYSIS OF THE DATA
5.1. Volumetric analysis
Depth sounding data is processed to show the evolution of the average sediment volume per unit
of surface, i.e. the average evolution of bed level as detected by a 210 kHz sounder. If more than
50% of the area of a (sub)zone is covered, an average siltation rate is calculated. For the period of
April - June 2008, depth soundings were performed on 11 April, 9 May and 4 June 2008. During
these measurements, an adequate coverage was obtained during depth soundings for subzones
A-D for zones 2, 3 and 4.
The bathymetric measurements in APPENDIX A and the corresponding bathymetric difference
maps in APPENDIX B show that the bed interface moves to decreasing depths between the
reference date of 13 March 2008 and the third depth sounding on 9 May 2008. A dredging
campaign of three weeks subsequently lowered the bed level in general.
From APPENDIX C, it is clear that for the three first months (March – May) a bed level increase
was observed. In general, the bed level increase levelled off a bit in time. A decrease was seen
from May to June and was obviously due to dredging. This resulted in a negative (volumetric)
siltation rate between 9 May and 4 June 2008. The positive siltation rates valued between 0.25 and
1.96 cm/day in the central trench (except for zone E). The rates for zone 3 were in the same range
as the values recorded in the annual sediment balance of 2007-2008 (IMDC, 2007n) for the
periods of 27/04/2007 – 27/07/2007 and 4/12/2007 – 25/1/2008. Instead, zone 4 showed similar
results. It could also be concluded that the siltation rates decreased when moving further inside the
dock (starting from the entrance); an exception to this behaviour however is zone 3D. This
longitudinal trend is also in accordance to previous measurements (see e.g. IMDC, 2007n). When
investigating the dock-transverse trend of the siltation rates, it could be seen that no significant
difference occurred between the northern and southern quays.
5.2. Densimetric analysis
Hopper maintenance dredging occurred during three consecutive weeks, i.e. 12 May – 1 June
2008 (see Table 5-1). BIS data revealed that more than 370x10³ TDS was dredged in this period.
Amounts of dredged mass decreased over the three weeks of activity. The majority of dredged
mass originated from zones 3A-C (more than 74%). The amount decreased when moving further
inside the dock, which is in accordance to the natural siltation rates, i.e. siltation rates lower too
when moving away from the Scheldt river inside the dock.
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Table 5-1: Dredged sediment mass (TDS)
zone
1
2
3a
3b
3c
3d
3e
4Na
4Nb
4Nc
4Nd
4Ne
4Za
4Zb
4Zc
4Zd
4Ze
5Na
Total
% Total
12-May-08 19-May-08 26-May-08
18-May-08 28-May-08 01-Jun-08 % Total
523 59931 34338 17708
946 8337 5739
2594 39 7668
5496
949 302 3
989 36320 36401 25536
5952 4706 5745
2216 157 6137
8591
3290 230 746 21332 25286 20847
8877 541 2455 5503
2962 1242 64 1054
887
239 15 2 0.6 31.5 25.8 17.2
4.2 0.1 4.2 4.6
2.1 0.4 0.0 4.0
4.0
1.2 0.1 0.0 0.0
144573 38.8
136270 36.5
92053 24.7
372895 From the measured vertical density profiles, the temporal evolution of planes of constant density
can be investigated. The results can be found in APPENDIX F. The lowering of these equal density
planes by dredging is clear (cf. 5 June 2008). Note also that a bump of sediment occurred at onethird of the dock’s back-end in the measurements of 22 February 2008 and, subsequently, being
dredged away in April 2008.
Vertical density profiles have also been numerically integrated to calculate the mass of dry solids
above a reference plane for each zone (i.e. the design depth of Deurganckdok t0d (see §2.1)). This
data availability also enables the use of the densimetric dredging data, cf. BIS data, in the mass
balance calculations. Adding up the measured and dredged masses leads to the total sediment
mass as shown in APPENDIX H. Results show a mass growth rate in the central trench (zones
3A-D) in the range of 1.8 to 13.5 kg/m²/day for the period February – June 2008. These numbers
are similar to those of September 2007 – February 2008 with values between 2 and 15 kg/m²/day.
Note also that the period of 28 April – 5 June showed larger growth rates than the period of 22
February – 28 April 2008. This difference seemed to be linked to dredging activities because only
in the former period dredging occurred. A similar observation was done in January – February
2008, where elevated growth rates occurred when including dredged masses in the calculations.
Zones 4N-A, 4N-B and 4N-C showed growth rates in the range of 2 – 6 kg/m²/day, being
comparable to those for the periods September–November 2007.
An overview of the total mass settled over time, for all zones that have been covered for 100%, is
shown in Table 5-2 and Table 5-3. From these figures, it is concluded that between the end of April
I/RA/11283/08.076/MSA
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and the beginning of June about 152x10³ tons of dry solids have settled in zones 3 and 4,
subzones A, B and C. This is in a similar range as for the period of mid-January to mid-February
(148x10³ TDS), but is much larger than the observed 76x10³ and 66x10³ tons of dry solids being
obtained for the periods September-October and October-November 2007 respectively.
Subdividing per subzone (Table 5-3), it is concluded that the settled mass in subzones A (nearest
to river) was generally larger than the settled mass in subzones B and C. This confirms the
hypothesis of a gradual decrease in siltation with distance from the Scheldt river.
Table 5-2: Total sediment mass (measured + dredged, in 10³ TDS) in some zones
zone
3a
3b
3c
3d
4Na
4Nb
4Nc
4Nd
4Za
4Zb
4Zc
4Zd
28-Apr-08 05-Jun-08
169
219
145
193
142
171
161
170
36
41
25
33
20
23
24
22
26
30
25
31
21
20
21
18
Table 5-3: Mass settled per subzone in zones 3 and 4 (measured + dredged, in 10³ TDS)
subzone A
subzone B
subzone C
subzone D
I/RA/11283/08.076/MSA
22-Feb-2008 / 28-Apr-2008 /
28-Apr-2008 05-Jun-2008
34
59
31
62
27
31
18
5
26
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IMDC NV i.s.m. WL|Delft Hydraulics
en Gems
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
6. REFERENCES
AMT(2003). Intern rapport, Getij-informatie Scheldebekken 1991-2000.
AWZ (2000): Baggerwerken 2000, Westerschelde en Zeeschelde
IMDC (2006a) Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing.
Deelrapport 1.6 Sediment balance Bathymetry: 2005 – 3/2006 (I/RA/11283/06.118/MSA)
IMDC (2006b) Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing.
Deelrapport 2.1 Through tide measurement SiltProfiler 21/03/2006 Laure Marie
(I/RA/11283/06.087/WGO).
IMDC (2006c) Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing.
Deelrapport 2.3 Through tide measurement Sediview spring tide 22/03/2006 Veremans
(I/RA/11283/06.110/BDC)
IMDC (2006d) Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing.
Deelrapport 2.4 Through tide measurement Sediview spring tide 27/09/2006 Parel 2
(I/RA/11283/06.119/MSA).
IMDC (2006e) Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing.
Deelrapport 2.6 Salt-Silt distribution & Frame Measurements Deurganckdok 13/3/2006 –
31/05/2006 (I/RA/11283/06.121/MSA).
IMDC (2006f). Uitbreiding studie densiteitsstromingen in de Beneden Zeeschelde in het kader van
LTV Meetcampagne naar hooggeconcentreerde slibsuspensies Deelrapport 6.1 Winter Calibration
(I/RA/11291/06.092/MSA), in opdracht van AWZ.
IMDC (2007a) Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing.
Deelrapport 1.1 Sediment Balance: Three monthly report 1/4/2006 – 30/06/2006
(I/RA/11283/06.113/MSA)
IMDC (2007b) Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing.
Deelrapport 1.2 Sediment Balance: Three monthly report 1/7/2006 – 30/09/2006
(I/RA/11283/06.114/MSA)
IMDC (2007c) Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing.
Deelrapport 1.3 Sediment Balance: Three monthly report 1/10/2006 – 31/12/2006
(I/RA/11283/06.115/MSA)
IMDC (2007d) Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing.
Deelrapport 1.4 Sediment Balance: Three monthly report 1/1/2007 – 31/03/2007
(I/RA/11283/06.116/MSA)
IMDC (2007e) Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing.
Deelrapport 1.5 Annual Sediment Balance (I/RA/11283/06.117/MSA)
IMDC (2007f) Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing. Deelrapport
2.2 Through tide measurement SiltProfiler 26/09/2006 Stream (I/RA/11283/06.068/MSA)
IMDC (2007g) Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing.
Deelrapport 2.5 Through tide measurement Sediview neap tide (to be scheduled)
(I/RA/11283/06.120/MSA)
IMDC (2007h) Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing.
Deelrapport 2.7 Salt-Silt distribution & Frame Measurements Deurganckdok 15/07/2006 –
31/10/2006 (I/RA/11283/06.122/MSA)
I/RA/11283/08.076/MSA
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Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
IMDC (2007i) Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing. Deelrapport
2.8 Salt-Silt distribution & Frame Measurements Deurganckdok 15/01/2007 – 15/03/2007
(I/RA/11283/06.123/MSA)
IMDC (2007j) Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing. Deelrapport
3.1 Boundary conditions: Three monthly report 1/1/2007 – 31/03/2007 (I/RA/11283/06.127/MSA)
IMDC (2007k) Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing.
Deelrapport 3.2 Boundary conditions: Annual report (I/RA/11283/06.128/MSA)
IMDC (2007l) Uitbreiding studie densiteitsstromingen in de Beneden Zeeschelde in het kader van
LTV Meetcampagne naar hooggeconcentreerde slibsuspensies Deelrapport 6.2 Summer
Calibration and Final Report (I/RA/11291/06.093/MSA)
IMDC (2007m). Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing.
Deelrapport 1.11 Sediment Balance: Two monthly report 1/7/2007 – 31/08/2007
(I/RA/11283/07.082/MSA).
IMDC (2007n). Langdurige metingen Deurganckdok: Opvolging en analyse aanslibbing.
Deelrapport 1.14 Annual sediment balance (I/RA/11283/07.085/MSA).
IMDC (2007o). Calibration stationary & mobile equipment winter (I/RA/11283/07.096/MSA).
IMDC (2008). Feasibility study of echo sounding to determine fluid mud density profiles
(I/NO/11283/08.001/BOB).
I/RA/11283/08.076/MSA
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APPENDIX A.
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
DEPTH OF THE WATER-BED
INTERFACE (210 KC)
I/RA/11283/08.076/MSA
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APPENDIX B.
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
EVOLUTION OF DEPTH OF WATER-
BED INTERFACE (210 KC)
I/RA/11283/08.076/MSA
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B.1 Difference maps
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B.2 Bed elevation evolution per section
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Opvolging aanslibbing Deurganckdok
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APPENDIX C.
VOLUMETRIC SILTATION RATES IN DIFFERENT
ZONES AND SECTIONS
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Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
C.1 Siltation rates (tabular)
Siltation rates in cm/day
1/ Per zone
1
2
3a
3b
3c
3d
3e
4Na
4Nb
4Nc
4Nd
4Ne
4Za
4Zb
4Zc
4Zd
4Ze
5Na
5Nb
5Nc
5Nd
5Ne
5Za
5Zb
5Zc
5Zd
5Ze
I/RA/11283/08.076/MSA
11‐Apr‐08 0.95 2.11 1.96 1.71 1.55 1.92 6.90 1.51 1.80 ‐0.23 0.30 7.14 2.03 1.60 1.26 0.96 4.98 ‐ ‐ ‐1.92 ‐0.42 ‐ 0.46 0.04 ‐ 0.77 4.51 09‐May‐08 ‐ ‐0.21
0.49 0.35 0.25 0.77
0.51 1.86 0.77
0.97 0.18 0.91 1.70
1.09 0.59 0.06
‐2.22 ‐ ‐ ‐
‐ ‐ 2.30
1.81 0.77 0.21 ‐
56
04‐Jun‐08 ‐ ‐0.72 ‐4.23 ‐4.43 ‐4.19 ‐0.86 ‐ ‐3.44 ‐3.68 ‐2.69 0.23 ‐ ‐3.64 ‐3.40 ‐2.15 0.10 ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ 0.42 ‐ versie 2.0 - 12/02/2009
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Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
2/ Per section
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
L1
L2
L3
I/RA/11283/08.076/MSA
11‐Apr‐08 0.60 1.11 1.52 1.94 1.61 1.35 2.19 1.71 1.40 ‐ 2.09 2.00 ‐3.95 ‐ 1.72 2.19 1.76 09‐May‐08 0.90 0.58 0.47
1.18 1.63 1.30
‐0.50 ‐ ‐ ‐
0.82 ‐0.08 4.14
‐
0.88 0.42 0.50
57
04‐Jun‐08 ‐3.00 ‐3.86 ‐3.75 ‐4.30 ‐4.11 ‐1.20 ‐0.88 ‐ ‐ ‐ ‐0.73 ‐0.44 ‐ ‐ ‐3.19 ‐3.05 ‐2.24 versie 2.0 - 12/02/2009
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en Gems
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
C.2 Water-bed interface evolution for all zones
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C.3 Water-bed interface evolution for all sections
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C.4 Siltation rate complete Deurganckdok
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APPENDIX D.
DEPTH OF WATER-BED INTERFACE AND EQUAL
DENSITY LAYERS
I/RA/11283/08.076/MSA
86
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APPENDIX E.
DEPTH OF PLANES OF CONSTANT DENSITY
I/RA/11283/08.076/MSA
93
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E.1 Measurements April 28th, 2008
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E.2 Measurements June 5th, 2008
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APPENDIX F.
DEPTH EVOLUTION OF PLANES OF CONSTANT
DENSITY
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APPENDIX G.
SEDIMENT MASS DISTRIBUTION IN
DEURGANCKDOK
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APPENDIX H.
AVERAGE MASS GROWTH AND GROWTH RATE
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H.1 Tabular results
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**Measured Mass (TDS/m²)
-----------22-Feb-08
1
2
1.19
3a
0.91
3b
3c
1.03
3d
0.92
3e
0.74
4Na
0.58
4Nb
4Nc
0.62
4Nd
0.87
4Ne
1.00
4Za
0.68
4Zb
4Zc
0.62
4Zd
0.82
4Ze
5Na
5Nb
5Nc
5Nd
5Ne
5Za
5Zb
5Zc
5Zd
5Ze
Trench area mean
I/RA/11283/08.076/MSA
1.00
131
28-Apr-08
1.68
1.31
1.22
0.90
0.98
0.81
0.68
0.48
1.07
0.79
0.72
0.54
0.82
0.55
0.32
0.62
0.59
0.32
-
05-Jun-08
1.00
0.87
0.86
0.85
0.70
0.50
0.51
0.39
0.60
0.53
0.50
0.42
0.52
0.46
0.23
0.73
0.44
0.23
-
1.25
0.89
versie 2.0 - 12/02/2009
IMDC NV i.s.m. WL|Delft Hydraulics
en Gems
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
**Cumulative dredged mass in covered area (TDS)
------------
I/RA/11283/08.076/MSA
1
2
3a
3b
3c
3d
3e
4Na
4Nb
4Nc
4Nd
4Ne
4Za
4Zb
4Zc
4Zd
4Ze
5Na
5Nb
5Nc
5Nd
5Ne
5Za
5Zb
5Zc
5Zd
5Ze
22-Feb-08
0
0
4033
1099
959
0
0
54
0
27
0
0
13
0
0
0
0
0
0
0
0
0
0
0
0
0
0
28-Apr-08
0
0
4033
1099
21624
43945
0
54
0
2203
8042
0
13
0
2305
4048
0
0
0
0
26
0
0
0
0
2
0
05-Jun-08
0
2258
121616
97124
85715
59720
541
15551
16987
9976
9480
64
14872
14975
6783
4594
2
3
0
0
26
0
0
0
0
2
0
Total
6185
87394
460289
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**Total cumulative mass(TDS/m²)
-----------22-Feb-08
28-Apr-08
1
2
1.227
1.72
3a
0.922
1.321
3b
3c
1.037
1.433
3d
0.917
1.232
3e
0.745
0.979
4Na
0.577
0.813
4Nb
4Nc
0.619
0.761
4Nd
0.874
0.721
4Ne
0.997
1.071
4Za
0.681
0.792
4Zb
4Zc
0.622
0.809
4Zd
0.815
0.662
4Ze
5Na
0.822
5Nb
5Nc
0.549
5Nd
0.319
5Ne
5Za
0.619
5Zb
5Zc
0.587
5Zd
0.317
5Ze
Trench area mean
I/RA/11283/08.076/MSA
1.015
133
1.41
05-Jun-08
2.231
1.754
1.726
1.302
1.125
1.044
0.893
0.681
1.211
1.008
0.76
0.563
0.515
0.462
0.235
0.728
0.438
0.228
1.721
versie 2.0 - 12/02/2009
IMDC NV i.s.m. WL|Delft Hydraulics
en Gems
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
**Growth rate (kg/m²/day)
-----------22-Feb-2008 / 28-Apr-2008 / 05Jun-2008
28-Apr-2008
1
-
I/RA/11283/08.076/MSA
2
3a
3b
3c
3d
3e
4Na
4Nb
4Nc
4Nd
4Ne
4Za
4Zb
4Zc
4Zd
4Ze
5Na
5Nb
5Nc
5Nd
5Ne
5Za
5Zb
5Zc
5Zd
5Ze
7.47
6.05
6.00
4.76
3.54
3.58
2.15
-2.32
1.12
1.67
2.84
-2.32
-
13.45
11.39
7.72
1.86
3.83
6.08
3.48
-1.07
3.70
5.70
-1.29
-2.61
-8.06
-2.28
-2.21
2.85
-3.92
-2.36
-
Trench area mean
5.97
8.18
134
versie 2.0 - 12/02/2009
IMDC NV i.s.m. WL|Delft Hydraulics
en Gems
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
**Covered Area
------------
1
2
3a
3b
3c
3d
3e
4Na
4Nb
4Nc
4Nd
4Ne
4Za
4Zb
4Zc
4Zd
4Ze
5Na
5Nb
5Nc
5Nd
5Ne
5Za
5Zb
5Zc
5Zd
5Ze
(ha)
0.00
0.00
8.68
10.99
9.91
13.06
5.04
3.19
3.12
2.57
3.28
1.27
1.60
3.12
2.59
3.23
1.21
0.67
0.82
0.83
1.02
0.30
0.33
0.96
0.88
1.14
0.39
22-Feb-08
(%)
0
0
88
100
100
100
39
88
100
100
100
38
66
100
100
100
39
29
41
46
43
13
25
48
49
48
16
28-Apr-08
(ha)
(%)
0.00
0
0.00
0
8.56
87
10.99
100
9.91
100
13.06
100
4.89
38
3.24
89
3.12
100
2.57
100
3.28
100
1.20
36
1.60
66
3.12
100
2.59
100
3.23
100
1.20
39
0.92
40
1.04
52
1.01
56
1.26
53
0.39
16
0.39
30
1.46
73
1.26
70
1.50
63
0.52
21
05-Jun-08
(ha)
(%)
0.00
0
0.00
0
8.35
85
10.99
100
9.91
100
13.06
100
4.94
38
3.14
86
3.12
100
2.57
100
3.28
100
1.25
38
1.56
64
3.12
100
2.59
100
3.23
100
1.17
38
0.87
38
1.13
57
1.10
61
1.32
55
0.30
12
0.38
29
1.10
55
1.04
58
1.20
50
0.36
15
Total
80.17
60
82.28
81.05
I/RA/11283/08.076/MSA
135
64
62
versie 2.0 - 12/02/2009
IMDC NV i.s.m. WL|Delft Hydraulics
en Gems
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
H.2 For each zone
I/RA/11283/08.076/MSA
136
versie 2.0 - 12/02/2009
IMDC NV i.s.m. WL|Delft Hydraulics
en Gems
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
H.3 For complete Deurganckdok
I/RA/11283/08.076/MSA
151
versie 2.0 - 12/02/2009
IMDC NV i.s.m. WL|Delft Hydraulics
en Gems
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
APPENDIX I.
DREDGING DATA
I/RA/11283/08.076/MSA
153
versie 2.0 - 12/02/2009
IMDC NV i.s.m. WL|Delft Hydraulics
en Gems
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
**Total dredged mass in covered area (TDS)
‐‐‐‐‐‐‐‐‐‐‐‐
13‐May‐08 20‐May‐08 27‐May‐08
1
0
0
0
2
523
989
746
3a
59931
36320
21332
3b
34338
36401
25286
3c
17708
25536
20847
3d
946
5952
8877
3e
0
0
541
4Na
8337
4706
2455
4Nb
5739
5745
5503
4Nc
2594
2216
2962
4Nd
39
157
1242
4Ne
0
0
64
4Za
7668
6137
1054
4Zb
5496
8591
887
4Zc
949
3290
239
4Zd
302
230
15
4Ze
0
0
2
5Na
3
0
0
5Nb
0
0
0
5Nc
0
0
0
5Nd
0
0
0
5Ne
0
0
0
5Za
0
0
0
5Zb
0
0
0
5Zc
0
0
0
5Zd
0
0
0
5Ze
0
0
0
Total
I/RA/11283/08.076/MSA
144573
136270
154
92053
versie 2.0 - 12/02/2009
IMDC NV i.s.m. WL|Delft Hydraulics
en Gems
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
APPENDIX J.
SWEEP BEAM DREDGING DATA
I/RA/11283/08.076/MSA
155
versie 2.0 - 12/02/2009
IMDC NV i.s.m. WL|Delft Hydraulics
en Gems
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
(dieptedata ontbreekt)
I/RA/11283/08.076/MSA
156
versie 2.0 - 12/02/2009
IMDC NV i.s.m. WL|Delft Hydraulics
en Gems
I/RA/11283/08.076/MSA
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
157
versie 2.0 - 12/02/2009
IMDC NV i.s.m. WL|Delft Hydraulics
en Gems
I/RA/11283/08.076/MSA
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
158
versie 2.0 - 12/02/2009
IMDC NV i.s.m. WL|Delft Hydraulics
en Gems
I/RA/11283/08.076/MSA
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
159
versie 2.0 - 12/02/2009
IMDC NV i.s.m. WL|Delft Hydraulics
en Gems
I/RA/11283/08.076/MSA
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
160
versie 2.0 - 12/02/2009
IMDC NV i.s.m. WL|Delft Hydraulics
en Gems
I/RA/11283/08.076/MSA
Opvolging aanslibbing Deurganckdok
Report 1.20: Sediment Balance 1/04/2008 - 30/06/2008
161
versie 2.0 - 12/02/2009